The principles behind pilates are great and they work really well. However, there are a hell of a lot of shockingly bad instructors out there who "teach" it in a very damaging way.
I did a pilates course a wee while back and fell out with the instructor because what they were doing was not healthy. They were at a level where they were writing books on the subject too...
Jools - does repeated bending forwards, say 10 times, make it worse?
Clareymorris - you sure that remedial massage can fix a prolapsed disc? Sounds like a masseuse not really knowing what they're doing to me.